diff --git a/CMS_CORE_Library/Fanuc/Nc_Fanuc.cs b/CMS_CORE_Library/Fanuc/Nc_Fanuc.cs
index 4aa5131..fcf2a96 100644
--- a/CMS_CORE_Library/Fanuc/Nc_Fanuc.cs
+++ b/CMS_CORE_Library/Fanuc/Nc_Fanuc.cs
@@ -1177,39 +1177,45 @@ namespace CMS_CORE.Fanuc
             nReturn = Focas1.cnc_upstart4(nLibHandle[0], 0, partProgramPath);
 
             //Throw Exception if there's an error 
-            if (nReturn != 0)
-                ThrowNCException(NC_PROD_ERROR, nReturn);
+            ErrorHandler(NC_PROD_ERROR, nReturn);
 
             do
             {
                 // Local buffer
-                char[] tmpContentBuffer = new char[256];// TODO find function to read size file
+                char[] tmpContentBuffer = new char[256]; // TODO find function to read size file
 
                 // Read file
                 nReturn = Focas1.cnc_upload4(nLibHandle[0], ref lenght, tmpContentBuffer);
 
                 // If File ended
-                if (nReturn == (short)Focas1.focas_ret.EW_RESET)
+                switch(nReturn)
                 {
-                    fileEnded = true;
+                    case (short)Focas1.focas_ret.EW_RESET:
+                        {
+                            fileEnded = true;
+                        }break;
+                    case (short)Focas1.EW_OK:
+                        {
+                            // Add the characters into string with all the content
+                            partProgramContent += new string(tmpContentBuffer);
+                        }break;
+                    case (short)Focas1.focas_ret.EW_BUFFER:
+                        {
+                            continue;
+                        }break;
+                    default:
+                        {
+                            ThrowNCException(NC_PROD_ERROR, nReturn);
+                        }break;
                 }
-                else if (nReturn == (short)Focas1.focas_ret.EW_OK) 
-                {
-                    // Add the characters into string with all the content
-                    partProgramContent += new string(tmpContentBuffer);
-                }
-                // TODO
-                //else if (nReturn != (short)Focas1.focas_ret.EW_BUFFER && nReturn != Focas1.focas_ret.EW_LENGTH) // case 10 = EW_BUFFER = wait until the buffer contains data
-                //{
-                //    ThrowNCException(NC_PROD_ERROR, nReturn);
-                //}
             } while ((nReturn == (short)Focas1.focas_ret.EW_OK || nReturn == (short)Focas1.focas_ret.EW_BUFFER) && !fileEnded);
 
             // End read
             nReturn = Focas1.cnc_upend4(nLibHandle[0]);
 
-            if (nReturn != 0)
-                ThrowNCException(NC_PROD_ERROR, nReturn);
+            ErrorHandler(NC_PROD_ERROR, nReturn);
+
+            partProgramContent = partProgramContent.Replace("\0", String.Empty);
         }
 
         public override void W_NCWritePartProgramFromFile(string partProgramPath, FileStream localFile)
@@ -1240,8 +1246,7 @@ namespace CMS_CORE.Fanuc
             nReturn = Focas1.cnc_dwnstart4(nLibHandle[0], 0, partProgramPath);
 
             //Throw Exception if there's an error 
-            if (nReturn != 0)
-                ThrowNCException(NC_PROD_ERROR, nReturn);
+            ErrorHandler(NC_PROD_ERROR, nReturn);
 
             //int lenghtMax = fileData.Length;
             System.Threading.Thread.Sleep(1000);
@@ -1250,14 +1255,12 @@ namespace CMS_CORE.Fanuc
             nReturn = Focas1.cnc_download4(nLibHandle[0], ref lenght, partProgramContent);
 
             //Throw Exception if there's an error 
-            if (nReturn != 0)
-                ThrowNCException(NC_PROD_ERROR, nReturn);
+            ErrorHandler(NC_PROD_ERROR, nReturn);
 
             nReturn = Focas1.cnc_dwnend4(nLibHandle[0]);
 
             //Throw Exception if there's an error 
-            if (nReturn != 0)
-                ThrowNCException(NC_PROD_ERROR, nReturn);
+            ErrorHandler(NC_PROD_ERROR, nReturn);
         }
 
         public override void NCCopyPartProgram(string partProgramPath, string newPartProgramPath, bool failIfExist)
@@ -1269,7 +1272,7 @@ namespace CMS_CORE.Fanuc
 
             // If the 2 path are the same
             if(partProgramPath == newPartProgramPath)
-                ThrowNCException(NC_PROD_ERROR, 0); // TODO FIX
+                ThrowNCException(NC_PROD_ERROR, 5); // TODO FIX
 
             if (failIfExist)
             {
@@ -1277,8 +1280,7 @@ namespace CMS_CORE.Fanuc
                 nReturn = Focas1.cnc_pdf_copy(nLibHandle[0], partProgramPath, newPartProgramPath);
 
                 //Throw Exception if there's an error 
-                if (nReturn != 0)
-                    ThrowNCException(NC_PROD_ERROR, nReturn);
+                ErrorHandler(NC_PROD_ERROR, nReturn);
             }
             else
             {
@@ -1286,6 +1288,28 @@ namespace CMS_CORE.Fanuc
                 // Find a function to check if file exist, delete and copy.
                 // Read and put file
                 // TODO
+                // 
+                nReturn = Focas1.cnc_pdf_copy(nLibHandle[0], partProgramPath, newPartProgramPath);
+                
+                if(nReturn == 5)
+                {
+                    Focas1.ODBERR errorDetails = new Focas1.ODBERR();
+                    Focas1.cnc_getdtailerr(nLibHandle[0], errorDetails);
+
+                    if (errorDetails.err_no == 4)
+                    {
+                        NCDeletePartProgram(newPartProgramPath, "");
+
+                        nReturn = Focas1.cnc_pdf_copy(nLibHandle[0], partProgramPath, newPartProgramPath);
+
+                        ErrorHandler(NC_PROD_ERROR, nReturn);
+                    }
+                }
+                else if(nReturn != 0)
+                {
+                    ThrowNCException(NC_PROD_ERROR, nReturn);
+                }
+
             }
         }
 
@@ -1296,16 +1320,21 @@ namespace CMS_CORE.Fanuc
 
             short nReturn;
 
-            nReturn = Focas1.cnc_pdf_del(nLibHandle[0], partProgramPath + "/" +  partProgramName);
+            nReturn = Focas1.cnc_pdf_del(nLibHandle[0], partProgramPath +  partProgramName);
 
-            if(nReturn != 0)
-                ThrowNCException(NC_PROD_ERROR, nReturn);
+            ErrorHandler(NC_PROD_ERROR, nReturn);
         }
         #endregion
 
         ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
         #region Subordinate Private Functions
 
+        private void ErrorHandler(uint errorClass, short exNum)
+        {
+            if (exNum != 0)
+                ThrowNCException(errorClass, exNum);
+        }
+
         private void ReadRelativeAxisPos(Focas1.POSELM pos, ref Dictionary<string, double> Axes)
         {
             //If is setted VISIBLE add to List
diff --git a/CMS_CORE_Library/Utils/Nc_Utils.cs b/CMS_CORE_Library/Utils/Nc_Utils.cs
index 7f7e006..f26977c 100644
--- a/CMS_CORE_Library/Utils/Nc_Utils.cs
+++ b/CMS_CORE_Library/Utils/Nc_Utils.cs
@@ -8,7 +8,9 @@ using System.Threading.Tasks;
 namespace CMS_CORE.Utils
 {
     public static class Nc_Utils
-    {//-------------------------------------------------------------------------------------------------------------------------------------------------
+    {
+        private static string partProgramFolder = "./tmp/";
+        //-------------------------------------------------------------------------------------------------------------------------------------------------
         // NC <-> .NET Conversions
 
         // INT -> 2 WORD
@@ -147,7 +149,7 @@ namespace CMS_CORE.Utils
         public static void WriteLocalFile(string fileName, string fileContent, ref FileStream fileReference)
         {
             // Create new local Part Program
-            fileReference = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Write);
+            fileReference = new FileStream(partProgramFolder + fileName, FileMode.OpenOrCreate, FileAccess.Write);
 
             // Write Part Program
             StreamWriter writer = new StreamWriter(fileReference);